/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/RigVMSchema.h
Returns true if a pin should be unfolded (represented by its subpins)
virtual bool CanUnfoldPin ( [URigVMController](API\Plugins\RigVMDeveloper\RigVMModel\URigVMController) * InController, const [URigVMPin](API\Plugins\RigVMDeveloper\RigVMModel\URigVMPin) * InPinToUnfold ) const